Fetch all routes for all Azure subnets that have a route table attached

Get-JAzRouteTableSummary.ps1

using namespace Microsoft.Azure.Commands.Profile.Models.PSAzureSubscription
using namespace Microsoft.Azure.Management.Internal.Resources.Utilities.Models
param(
  $Subscriptions = $(Get-AzSubscription)
)

$Subscriptions
| Where-Object State -ne 'Disabled'
| ForEach-Object {
  $context = Select-AzSubscription -SubscriptionID $PSItem.Id
  $rtables = Get-AzRouteTable
  foreach ($table in $rtables) {
    $subnets = $table.Subnets
    if (-not $subnets) {
      Write-Warning "$($table.Id) has no associated subnets, skipping..."
      continue
    }
    $routes = Get-AzRouteConfig -RouteTable $table
    foreach ($subnet in $subnets) {
      [ResourceIdentifier]$subnetId = $subnet.Id
      foreach ($route in $routes) {
        [PSCustomObject]@{
          Subscription = $context.Subscription.Name
          VirtualNetwork = $subnetId.ParentResource.split('/')[1]
          Subnet = $subnetId.ResourceName
          RouteTable = $table.Name
          RouteName = $route.Name
          Destination = $route.AddressPrefix
          NextHopType = $route.NextHopType
          NextHop = $route.NextHopIpAddress
        }
      }
    }
  }
}